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1) Learning welding a good idea?
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yes. your brother trade is fitter and welding is a big part of that trade. welding is always a good skill in many of the trades.
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I've heard that once you learn welding that it is all that you do. I want to complete my plumbing up and to the journeyman's license as well.
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I believe that is different in each local and what your local includes. In my area, it is a combined plumber/fitter local so they go for a year or 2 and learn the common portions of the trade. Then they are required to decide plumber or fitter. If your local whatever it takes, do not let them pigeon hole you into being a welder at the cost of the plumber training.
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2) True that I would wind up being a full time welder?
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hopefully explained a bit above but if you want to be a plumber or fitter, do what it takes to get that training.
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3) Any good weld book recommends?
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I can;t recommend any offhand.
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4) Which welding processes should/not be learned and why?
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everone you have the access to learning.
stick (smaw)- it is the most common type in the construction trade- most usable in a poorly controlled environment
mig (gmaw)- easy to learn. good production type welding in many situations. can be used in many situations, not as dirty as stick
tig/heliarc (gtaw)- not as common in the pipe trades but is a nice process for small welds, if available. The best method for aluminum and stainless steel. cleaner than any other process
gas welding- personally, I do not know if this is used in any trade but brazing is so knowledge of the equipment is very important in the pipe trades.